Blue Sea Slugs, or Blue Dragons, or Blue Mollusks live off shore of Australia and South Africa.
They float upside down on ocean currents until they find their prey — Portuguese Man o’ Wars.
They attach themselves to the tentacles of the large, giant, venomous jellyfish-like creatures and feed.
They store the Man o’ War’s venom in the spiny finger-like protrusions.
The venom becomes so concentrated in their tiny, 10x-smaller bodies, they pack a vicious sting.
P.S. They are hermaphrodites — possessing both male and female sex parts. Both partners in a pair produce eggs.